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You mean a database!

Is it working?
Do you have a question?

BTW that massive if statement you have in your action performed method can be replaced with:


((JButton)a.getSource()).setText(letter);

Because you are doing things in the wrong order!

Just had a quick look: why do you check if the game is over before you update the button with 'X' or 'O'?

Update: just ran your code and due to the above problem it reports that the wrong player...